Intro to Mobile
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Transcript of Intro to Mobile
Introduction to Mobile Computing
CNT 5517-5564
Dr. Sumi HelalComputer & Information Science & Engineering Department
University of Florida, Gainesville, FL [email protected]
Fantastic Breakthrough Technology
• Wireless communication networks– multiple networks “covering” the globe– wold-wide deregulation and spectrum auctions – standard communication systems and air link
interfaces• Portable information appliances – laptops, notebooks, sub-notebooks, and MNCs– hand-held computers– PDAs and Smartphones
• Internet: – TCP/IP & de-facto application protocols – ubiquitous web content
New Forms of Computing
• Wireless Computing• Nomadic Computing• Mobile Computing• Ubiquitous Computing• Pervasive Computing• Invisible Computing
• Distributed Computing (Client/Server)
Mobile Computing
• Using:– small size portable computers, hand-helds, MNC, and
other small wearable devices,• To run stand-alone applications (or access
remote applications) via:– wireless networks: IR, BlueTooth, W-LANs, Cellular,
W-Packet Data networks, SAT. etc.• By:– nomadic and mobile users (animals, agents, trains,
cars, cell phones, ….)
Nomadic, Mobile & Ubiquitous
No Network
Mobile ComputingNomadic Computing
Wireless Network (B)
Fixed Network
Wireless Network (A)
FixedWireless Network
Ubiquitous Computing
Another View of Ubiquitous Computing
• Mark Weiser’s views• http://www.ubiq.com/hypertext/weiser/UbiHome.html
Impressive Wireless Infrastructure!
Satellite
Macro-CellMicro-Cell
UrbanIn-Building
Pico-Cell
Global
Suburban
dik © In-Room(BlueTooth)
Wireless Communication Technology
(IMT-2000)
Wireless Network Convergence2G/3G Mobility-Bandwidth Trade-off
Mob
ility
Bandwidth10K 100K 1M 10M 100M 1G
Room
Global GSM
D-AMPS/IS-95
DECTDECT
DECT
WLAN
UMTSNational
Regional
Metropolitan
Campus
Office
1-7 GHz
0.1-2 GHz
0.1-2.3 GHz
2-4 GHz
2-7 GHz
>2 GHz
20-50 GHz
Wireless Network Overlay
Satellite
Macro-CellMicro-Cell
UrbanIn-Building
Pico-Cell
Global
Suburban
dik ©
GSM Base Stations in Europe
Nokia PrimeSite
Ericsson RBS 2000
September 1997
UMTS: Universal Mobile Telecomm. Standard
• Global seamless operation in multi-cell environment (SAT, macro, micro, pico)
• Global roaming: multi-mode, multi-band, low-cost terminal, portable services & QoS
• High data rates at different mobile speeds: 144kbps at vehicular speed (80km/h), 384 kbps at pedestrian speed, and 2Mbps indoor (office/home)
• Multimedia interface to the internet• Based on core GSM, conforms to IMT-
2000. Deployment as early as 2002. UMTS
ETSI
SMG
ITU
IMT-2000FPLMTS
IMT
Apple’s Newton
1987
The Palm1990
Motorola Marco
• 1995
1995
Specs• Newton OS 1.3• 4MB ROM• 687KB Flash RAM• 320x240 Monochrome LCD resistive
touchscreen• RS422 serial port• Localtalk support• 1 PCMCIA Slot (5V or 12V)• 1 Sharp ASK infrared port• 4 AA batteries, rechargeable NiCd batteries may
be used• First released January 1995• It weighs 1.8 pounds and is 7.5 inches high, 5.8
inches wide and 1.4 inches deep• Street price: USD 900-1400
Motorola Envoy
1996
The Pocket PC
1998
The Nokia 9000 Communicator
1996
The Hand-Held Computer: Sharp Zaurus
1998
The Vadem Clio: Hand-Held?, Tablet? Other?
1999
The Tablet PCFujitsu Stylistic 2300/3400
2002
Laptops, Notebook, Sub Notebooks & Netbooks
Laptops: 1991Notebooks: 1996Netbooks: 2006
The First Wrist PC: Ruputer
Japan’s PHS Phone, Year 2001
Wearable Computers
More Wearable -- Via PC
Http://ww.via-pc.com
Wireless Helmet?
The Power Ring
NTT Key Fingers
The Projection Keyboard
http://www.canesta.com
Today
The iphone
Plastic Logic QUE 22Moo
MyVu
Portable projectors
Andriod
The iPad
Mobile Technology WarsThe Smart Phone
The Pad
Smart Phones
Smart Phones
2009
Re-Inventing the Tablet: The New War of the PADs
20102010-2011
Microsoft: Soon
Beneficiaries of Ubiquitous Computing
• Commuters• Travelers• Stock traders• Medical • Law enforcement• Package delivery • Education• Insurance• Emergency• Trucking• Intelligence• Military
ClientsAdhoc network
Servers
Intranet
Internet
Limitations of the Mobile Environment
Limitations of the Wireless Network heterogeneity of fragmented networks frequent disconnections limited communication bandwidth
Limitations Imposed by Mobility Limitations of the Mobile Computer
Frequent Disconnections
Handoff blank out (>1ms for most cellulars) Drained battery disconnection Battery recharge down time Voluntary disconnection (turned off to
preserve battery power, also off overnight) Theft and damage (hostile environment) Roam-off disconnections
Limited Communication Bandwidth
Orders of magnitude slower than fixed network Higher transmission bit error rates (BER) Uncontrolled cell population
Difficult to ensure Quality of Service (QoS) Availability issues (admission control)
Asymmetric duplex bandwidth Limited communication bandwidth exacerbates
the limitation of battery lifetime.
Limitations of the Mobile Computer
Short battery lifetime (max ~ 5 hours) Subject to theft and destruction => unreliable Highly unavailable (normally powered-off to
conserve battery) Limited capability (display, memory, input
devices, and disk space) Lack of de-facto general architecture: hand-
helds, communicators, laptops, and other devices
Caesar and Brutus
Limitations Imposed by Mobility
Lack of mobility-awareness by applications inherently transparent programming model (object-,
components-oriented, but not aspect-oriented) lack of environment test and set API support
Lack of mobility-awareness by the system network: existing transport protocols are inefficient to use
across heterogeneous mix of fixed/wireless networks session and presentation: inappropriate for the wireless
environment and for mobility operating systems: lack of env. related conditions and signals client/server: unless changed, inappropriate and inefficient
Reading Assignment
Pervasive Computing: Vision and Challenges, M. Satyanarayanan, Carnegie Mellon University, IEEE Personal Communications, August 2001